Social psychologist Ben Monroe has returned to Tokyo after a failed marriage, determined to seek out his former lover Kozue. His estranged teenage daughter Mazzy reluctantly flies from California to join him. On the flight she meets a young Japanese man, Koji, a cult survivor, who tells her the story of the luminous night princess Kaguya, a powerful tale of beauty and obsession. As Ben delves deeper into the underworld in search of Kozue, Mazzy and Koji are compelled to follow, and their four li...